1. Internal Medicine and Gastroenterology Unit, Complesso Integrato Columbus, Catholic University, Rome, Italy
2. University Hospitals Leuven, Department of Gastroenterology, Leuven, Belgium
3. Medical University of Vienna, Department of Internal Medicine III, Vienna, Austria
4. Gastroenterology and Hepatology Department, Université Lille Nord de France, Lille, F-59000, France
5. Hospital for Sick Children, University of Toronto, Toronto, Canada
6. Department of Pediatrics, Gastroenterology and Nutrition, Jagiellonian University School of Medicine, Krakow, Poland
7. Medizinische Klinik für Gastroenterologie, Charité-Universitätsmedizin Berlin, Germany
8. IBD Clinical and Research Centre, ISCARE Lighthouse and 1st Medical Faculty, Charles University, Prague, Czech Republic
9. Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands